<!DOCTYPE html>
<html lang="zh-cn">
  <head>
    <meta charset="UTF-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1.0"
    />
    <title>Document</title>
  </head>
  <body>
    <button
      type="button"
      class="btn"
    >
      btn
    </button>
    <button
      type="button"
      class="btn2"
    >
      btn2
    </button>
    <button
      type="button"
      class="btn3"
    >
      btn3
    </button>
    <button
      type="button"
      class="btn4"
    >
      btn4
    </button>
    <ul class="container"></ul>
    <script src="./index.js"></script>
    <script src="./index2.js"></script>
    <script src="./index3.js"></script>
    <script src="./index4.js"></script>
  </body>
</html>
